Answer
$20-x$
Work Step by Step
The phrase 'a number $x$ subtracted from 20' means the difference between 20 and x. Therefore, we are subtracting x from 20. In symbols, this is $20-x$.
Basic College Mathematics (10th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0134467795
ISBN 13:
978-0-13446-779-5
Chapter 9 - Basic Algebra - Review Exercises - Page 699: 104
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